Folding Chair Locking Assembly for Multi-Position Height Adjustment
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Solution Overview
Problem
Conventional folding chairs lack the ability to adjust height, limiting their adaptability to different user needs as they can only exist in a fully unfolded or fully retracted state.
Innovation Solution
A height-adjustable folding chair design featuring a base with retractable arms and legs, a locking assembly with a leg unlock button and spring mechanism, and positioning slots and blocks that allow for two distinct unfolding states, enabling adjustable height settings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the folding chair is designed with only two stable states (fully unfolded and fully retracted), then the structure is simple and easy to manufacture, but the adaptability to different user needs is poor
Solution Approach 1:
The locking assembly is designed to enable the leg to be locked at multiple positions (fully retracted, first unfolded state, second unfolded state) rather than only two fixed states. The first locking block with multiple locking slots and the positioning tongue work together to provide dynamic position adjustment, allowing the chair height to be changed according to different user needs while maintaining structural simplicity
Solution Approach 2:
The invention changes the parameter of leg extension distance by providing multiple locking positions. The first locking block defines multiple locking slots at different positions, and the positioning tongue can engage with different slots to achieve different leg extension distances, thereby changing the chair height parameter to adapt to different users
2Ease of operation
If the folding chair has fixed height and width when unfolded, then the manufacturing precision requirements are lower, but the ease of operation is reduced due to lack of adjustability
Solution Approach 1:
The locking assembly is designed to be operated easily by the user through the leg unlock button. The first spring provides automatic locking force to engage the positioning tongue with the locking slots, and the button mechanism allows users to release the lock with minimal effort. This self-service design makes the adjustment operation convenient while maintaining reliable locking
Solution Approach 2:
The locking mechanism is segmented into distinct components: the first locking block with multiple locking slots, the positioning tongue with positioning slot, and the leg unlock button with spring. This segmentation allows each component to perform its specific function precisely, with the locking slots providing precise positioning points and the button mechanism providing easy operation
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The chair can be easily adjusted to two different heights, enhancing user experience by accommodating various user needs and improving usability.
Implementation Method 1
a first spring arranged in the leg unlock button
Implementation Method 2
a second spring sleeved in the arm unlock button
Data Source
AI summary
The present disclosure proposes a height-adjustable folding chair including a base, retractable arms connected to the base and legs connected to the base; the base includes a support enclosing an inner cavity and a locking assembly arranged in the inner cavity; the support includes an upper receiving portion connected to the arms and a lower receiving portion connected to the legs; the locking assembly includes a leg unlock button inserted in the inner cavity and slidable relative to the support, a first spring, and a first locking block. The first locking block defines locking slots each with a downward opening; an end of each leg connected to the lower receiving portion defines a positioning slot and is arranged with a positioning tongue protruding from an edge of the positioning slot and a positioning block protruding upward from a bottom of the positioning slot and matched with a corresponding locking slot.